Operation of LEDs in ophthalmic instruments

A compact power supply system using an inductor and capacitor with alternating charging and lighting sequences addresses the inefficiencies of traditional power methods in ophthalmic instruments, achieving efficient and space-saving LED operation.

DE102024137459A1Pending Publication Date: 2026-06-18HAAG-STREIT GMBH
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Patent Information

Application Number
DE102024137459
Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-12-12
Publication Date
2026-06-18

AI Technical Summary

Technical Problem

Existing ophthalmic instruments face challenges in providing a space-efficient and efficient power supply for LEDs, often requiring cumbersome power cables or batteries with additional electronics for voltage adaptation, which occupy valuable space and are inefficient.

Method used

A method utilizing an inductor and capacitor in series with a voltage source to create a compact power supply system that alternates charging and lighting sequences, employing a switching mechanism to control current flow and limit rates, thereby optimizing energy efficiency and reducing space requirements.

Benefits of technology

This approach enables efficient, space-saving power delivery to multiple LEDs, ensuring consistent brightness levels and prolonged light pulses while minimizing energy consumption and component size.

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Abstract

An ophthalmic instrument is equipped with LEDs (6). In addition to the LEDs (6), the instrument has a voltage source (B), an inductor (L), and a capacitor (C). The method for operating the instrument comprises at least one charging sequence (Z1) and one illumination sequence (Z2). The charging sequence includes at least a first and at least a second phase (P1, P2). In the first phase (P1), the voltage source (B) and the inductor (L) are connected in series. In the second phase (P2), the inductor (L) and the capacitor (C) are connected in series. The illumination sequence (Z2) comprises at least a third and at least a fourth phase. In the third phase (P3), the LED(s) (6), the inductor (L), and the capacitor (C) are connected in series. In the fourth phase (P4), the LED(s) and the inductor (L) are connected in series. In the charging sequence (Z1), the inductor (L) serves to transfer energy from the voltage source (B) to the capacitor (C).In the lighting sequence, the coil (L) is used for current regulation or control of the LEDs (6).
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